package org.bouncycastle.asn1.x509;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERGeneralizedTime;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;

/**
 * <pre>
 *    PrivateKeyUsagePeriod ::= SEQUENCE {
 *      notBefore       [0]     GeneralizedTime OPTIONAL,
 *      notAfter        [1]     GeneralizedTime OPTIONAL }
 * </pre>
 */
public class PrivateKeyUsagePeriod extends ASN1Encodable {
    public static PrivateKeyUsagePeriod getInstance(Object obj) {
        if (obj instanceof PrivateKeyUsagePeriod) {
            return (PrivateKeyUsagePeriod) obj;
        }

        if (obj instanceof ASN1Sequence) {
            return new PrivateKeyUsagePeriod((ASN1Sequence) obj);
        }

        if (obj instanceof X509Extension) {
            return getInstance(X509Extension.convertValueToObject((X509Extension) obj));
        }

        throw new IllegalArgumentException("unknown object in getInstance");
    }

    private DERGeneralizedTime _notBefore, _notAfter;

    private PrivateKeyUsagePeriod(ASN1Sequence seq) {
        Enumeration en = seq.getObjects();
        while (en.hasMoreElements()) {
            ASN1TaggedObject tObj = (ASN1TaggedObject) en.nextElement();

            if (tObj.getTagNo() == 0) {
                _notBefore = DERGeneralizedTime.getInstance(tObj, false);
            } else if (tObj.getTagNo() == 1) {
                _notAfter = DERGeneralizedTime.getInstance(tObj, false);
            }
        }
    }

    public DERGeneralizedTime getNotBefore() {
        return _notBefore;
    }

    public DERGeneralizedTime getNotAfter() {
        return _notAfter;
    }

    public DERObject toASN1Object() {
        ASN1EncodableVector v = new ASN1EncodableVector();

        if (_notBefore != null) {
            v.add(new DERTaggedObject(false, 0, _notBefore));
        }
        if (_notAfter != null) {
            v.add(new DERTaggedObject(false, 1, _notAfter));
        }

        return new DERSequence(v);
    }
}
